/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/Snapping/PointPlanarSnapSolver.h
Returns true when the active snap represents an intersection of multiple target lines in the plane. In such a case, one line can be obtained by the usualGetActiveSnapLine(), and the second can be obtained fromGetIntersectionSecondLine()
bool HaveActiveSnapIntersection()